A number, on subtracting 15 from it, reduces to its 80%. What is 40% of the numb

Question

A number, on subtracting 15 from it, reduces to its 80%. What is 40% of the number?

Options:

A . 75

B . 30

C . 90

D . 60

Answer: Option B
Answer: (b)If the number be x, thenx – 15 = ${4x}/5$5x – 75 = 4x ⇒ x = 7540% of 75 = ${75 × 40}/100 = 30$

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